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9th Mar 2018, 22:31
Replies: 37
Views: 17,204
Posted By CAAAD

[QUOTE=lomapaseo;10078600]Well they are like...

[QUOTE=lomapaseo;10078600]Well they are like aircraft components such as keel beams and wing spars sized and life limited to not fail and if the(engine) do fail the aircraft design need to provide...
9th Mar 2018, 19:38
Replies: 37
Views: 17,204
Posted By CAAAD

Engine Certification Requirements are quite...

Engine Certification Requirements are quite clear. All failures must be contained. Blades, vanes and so on.
Discs and possibly shafts are the only components where non contained failures are...
4th Oct 2017, 11:09
Replies: 554
Views: 530,322
Posted By CAAAD

I think it may well be a fan blade. The...

I think it may well be a fan blade.

The dovetail root length from the very useful GA is about half the span of the fan OGV, and the leading edge of the fan blade is about one OGV span from root to...
Forum: Rotorheads
12th Sep 2014, 20:03
Replies: 228
Views: 43,803
Posted By CAAAD

I asked my original question about texting...

I asked my original question about texting because it seemed to be an unnecessary distraction.

I studied the AAIB report a bit further, and found a meticulous investigation, but a disappointing...
Forum: Rotorheads
10th Sep 2014, 21:11
Replies: 228
Views: 43,803
Posted By CAAAD

I am a bit surprised that in a high workload...

I am a bit surprised that in a high workload environment such as seems to have been the case, single pilot, poor visibility, and so on, the pilot was texting. Although I may be a bit old fashioned...
5th Jun 2013, 18:19
Replies: 992
Views: 951,815
Posted By CAAAD

I'm afraid I disagree with Mr Leahy. ...

I'm afraid I disagree with Mr Leahy.


(John Leahy, the chief operating officer of Airbus, said that the number of incidents was small and the company had no plans at the present time to review...
15th May 2013, 16:57
Replies: 2,186
Views: 900,782
Posted By CAAAD

Imopaseo Your favourable experience of the...

Imopaseo

Your favourable experience of the Special Condition process may possibly have been as a result of acting on behalf of American Industry.

But the really contentious SCs are not data...
15th May 2013, 10:02
Replies: 2,186
Views: 900,782
Posted By CAAAD

Special Conditions

Iomapaseo

Your description of the process does not coincide with my understanding and experience.

A Special Condition is applicable only to a specific type or variant.

It is initially agreed...
Forum: Tech Log
16th Jan 2011, 16:20
Replies: 746
Views: 150,928
Posted By CAAAD

bear I think you are incorrect in your...

bear

I think you are incorrect in your suppositions, which do not seem to be shared by anyone else.

The 'cove' at the bottom of the incorrect counterbore is the runout radius of the...
Forum: Tech Log
9th Jan 2011, 08:18
Replies: 746
Views: 150,928
Posted By CAAAD

Turbine D - The FAA, being sensible people, would...

Turbine D - The FAA, being sensible people, would not have repeated all of the work done by EASA in certificating the Trent. Similarly they will not be very much involved in routine continued...
Forum: Tech Log
8th Jan 2011, 18:30
Replies: 746
Views: 150,928
Posted By CAAAD

Turbine D The Trent is not a US engine. It...

Turbine D

The Trent is not a US engine. It is from the UK and is therefore certicated by EASA. So the FAA process you quoted does not strictly speaking apply.

However the FAA process appears...
Forum: Tech Log
8th Jan 2011, 15:38
Replies: 746
Views: 150,928
Posted By CAAAD

DERG - Oils are approved for use by brand name,...

DERG - Oils are approved for use by brand name, not spec. A new brand will need to be extensively tested before clearance including lab tests and endurance running. Testing is the responsibility of...
Forum: Tech Log
3rd Jan 2011, 14:08
Replies: 746
Views: 150,928
Posted By CAAAD

Bearfoil - Have we had confirmation that wear was...

Bearfoil - Have we had confirmation that wear was present in the stub pipe? You seem to be pretty convinced but I haven't seen a single supporting opinion.

Was the HP/IP structure damaged prior...
Forum: Tech Log
26th Dec 2010, 21:15
Replies: 2,053
Views: 1,219,973
Posted By CAAAD

ChristiaanJ - Upon reflection, I'm not sure that...

ChristiaanJ - Upon reflection, I'm not sure that it was the Relight Envelope, but the shape is similar to an engine performance relationship where the 'horse's neck' was referred to.

But the...
Forum: Tech Log
26th Dec 2010, 17:34
Replies: 746
Views: 150,928
Posted By CAAAD

bearfoil - but the rest of the world , including...

bearfoil - but the rest of the world , including those who have seen and handled the part in question seem to take the view that it was mis-machined. These people will include RR engineers, EASA...
Forum: Tech Log
26th Dec 2010, 16:32
Replies: 2,053
Views: 1,219,973
Posted By CAAAD

ChristiaanJ - The general shape of the...

ChristiaanJ - The general shape of the limitations looks very much like the Olympus Relight Envelope.
Forum: Tech Log
15th Dec 2010, 19:42
Replies: 40
Views: 3,635
Posted By CAAAD

DERG - Yes, I'm sure I won't be missed, But ...

DERG - Yes, I'm sure I won't be missed, But

WHAT ABOUT THE 535 OIL TEMPERATURE

Sorry to shout, but you really are a bit irritating
Forum: Tech Log
15th Dec 2010, 16:24
Replies: 40
Views: 3,635
Posted By CAAAD

DERG - If oil vapourises at 150degC, why is the...

DERG - If oil vapourises at 150degC, why is the scavenge oil temp of the RB211 535, just about the most reliable gas turbine in existence set at 177degC?

I'm leaving this sideshow now because I...
Forum: Tech Log
15th Dec 2010, 13:52
Replies: 40
Views: 3,635
Posted By CAAAD

DERG The engine will have demonstrated max oil...

DERG The engine will have demonstrated max oil temps etc during endurance testing prior to certification. Cooling will also have been demonstrated to the Regulator's satisfaction.

Are you...
8th Dec 2010, 15:02
Replies: 1,964
Views: 1,108,636
Posted By CAAAD

Bearfoil - Many ADs make reference to possible...

Bearfoil - Many ADs make reference to possible outcomes to justify their application. The spline wear AD refers to excessive axial movement leading to possible non containment. This is what could...
8th Dec 2010, 10:53
Replies: 1,964
Views: 1,108,636
Posted By CAAAD

firstfoor - Yes, all agreed. But the official...

firstfoor - Yes, all agreed. But the official account talks of a stub-pipe, which could be a part of a casing. Or a short tube.
8th Dec 2010, 09:26
Replies: 1,964
Views: 1,108,636
Posted By CAAAD

Ferpe - All very true, in fact it's very...

Ferpe - All very true, in fact it's very important to keep the ball bearings properly loaded at all times.

I seem to remember RB 211-22B problems with lightly loaded bearings at some phases of...
Forum: Tech Log
5th Dec 2010, 21:17
Replies: 130
Views: 29,378
Posted By CAAAD

bearfoil - I'm sorry if I've caused offence. Just...

bearfoil - I'm sorry if I've caused offence. Just to clear the air a bit

I have never couched myself as a 'professional' anything. And not a Mod.

It is often easier to understand a point of...
Forum: Tech Log
5th Dec 2010, 19:13
Replies: 130
Views: 29,378
Posted By CAAAD

bearfoil - I choose my words carefully, and I try...

bearfoil - I choose my words carefully, and I try not to give offence and avoid sarcasm. Also I try not to be light hearted but it's a bit difficult when faced with some posts.

But to get to your...
Forum: Tech Log
5th Dec 2010, 15:23
Replies: 130
Views: 29,378
Posted By CAAAD

DERG - Thank you for that. But spline wear seems...

DERG - Thank you for that. But spline wear seems to be a problem on all Trent 900 engines, hence the AD. Are you suggesting that they all suffer from oil leakage into the combustion system, causing...
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